The mouse wheel height change is dependent on two things:
1. The height number - this determines the height of the brush template on your cursor when you move it about.
2. The number of rows on your pfb - this tells you how many rows to move up when you scroll.
So if your code was like this and your height number was 10:
prow0x0 = 00000000000000000000
prow1x0 = 00000000000000000000
prow2x0 = 00000000000000000000
prow3x0 = 00000000000000000000
prow4x0 = 00000000000000000000
prow5x0 = 00000000000000000000
prow6x0 = 00000000000000000000
prow7x0 = 00000000000000000000
prow8x0 = 00000000000000000000
prow9x0 = 00000000000000000000
prow10x0 = 11111111111111111111
prow11x0 = 11111111111111111111
prow12x0 = 11111111111111111111
prow13x0 = 11111111111111111111
prow14x0 = 11111111111111111111
prow15x0 = 11111111111111111111
prow16x0 = 11111111111111111111
prow17x0 = 11111111111111111111
prow18x0 = 11111111111111111111
prow19x0 = 11111111111111111111
In this example you have a 10 row high wall, but the height for the block is still 20 because there are 20 rows of data, this means your height adjustment for the mousewheel will still be 20.
What you need to do is set your height to 10, and remove the data that you do not need from the extra rows, like this:
prow10x0 = 11111111111111111111
prow11x0 = 11111111111111111111
prow12x0 = 11111111111111111111
prow13x0 = 11111111111111111111
prow14x0 = 11111111111111111111
prow15x0 = 11111111111111111111
prow16x0 = 11111111111111111111
prow17x0 = 11111111111111111111
prow18x0 = 11111111111111111111
prow19x0 = 11111111111111111111
That should then give you a 10 row high wall, and your mouse will scroll up 10 rows.
i5, NV960 2GB, 16GB memory, 2x 2TB Hybrid, Win10.